What are your specific offhand shooting exercises if you do any?

Muscle tone with practice can and will help one to be a better offhand shooter. I never did any physical exercise in my younger days, except dry fire. I still do dry fire, but my arm strength really went down hill.
This post is wondering what offhand shooters are doing or not doing to prevent gun wobble. If you are using any kind of support or sling, please do not include that type of reply. (Offhand shooting per NMLRA rules)
We all want to be good shots, just wondering how some of you shooters are going about it?

I’m getting old enough to except the fact that I’ll never be as fit as I once was. Not waiting till I’m to frail to do it I had a T-bone and two cocktails for supper.

Consistent practice and dry firing are key, but I also use https://www.trampoline-warehouse.co.uk/collections/rectangular-trampolines for low-impact cardio. It helped steady my heart rate and reduce wobble in my offhand stance. The controlled bounce builds leg and core stability without jarring my joints.